363-206-204
GLOSSARY
Issue 9 October 1998
GL-9
Free Running
An operating condition of a clock in which its local oscillator is not locked to an
internal synchronization reference and is using no storage techniques to sustain
its accuracy.
FT-2000
Lucent Technologies’s SONET OC-48 lightwave system
Function Group (Fn)
The set of circuit pack slots into which a set of function units can be inserted.
These may be Fn A, B or C.
Function Unit
Refers to any one of a number of different circuit packs that can reside in the A, B,
or C function unit slots on the DDM-2000 OC-3 Multiplexer, in the A, B, C, or D
function unit slots of the DDM-2000 OC-12 Multiplexer, or in such slots in the
FiberReach.
G
GNE
Gateway Network Element — A network element that funnels information
between several network elements and their supporting operations systems. Can
also be a DSNE. Beginning with Release 7.2 the GNE is whichever terminal is
being used as an X.25 port. There can be more than one DNE in a network. Prior
to Release 7.2 (Releases 7.1 and 6.x) the DNE was set (provisioned) manually.
Group
The eight related slots that may be equipped.
GTP
General Telemetry Processor.
H
HDSL
High data rate Digital Subscriber Line
Holdover
An operating condition of a network element in which its local oscillator is not
locked to any synchronization reference but is using storage techniques to main-
tain its accuracy with respect to the last known frequency comparison with a syn-
chronization reference.
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